Quarter	US dollars
1986-09-30	53042
1986-12-31	55171
1987-03-31	63932
1987-06-30	68112
1987-09-30	78680
1987-12-31	96500
1988-03-31	96610
1988-06-30	92360
1988-09-30	106452
1988-12-31	102951
1989-03-31	103502
1989-06-30	96256
1989-09-30	105751
1989-12-31	106352
1990-03-31	103061
1990-06-30	103121
1990-09-30	120610
1990-12-31	120841
1991-03-31	104608
1991-06-30	101265
1991-09-30	104306
1991-12-31	98955
1992-03-31	89355
1992-06-30	82586
1992-09-30	82634
1992-12-31	67199
1993-03-31	69845
1993-06-30	65548
1993-09-30	68608
1993-12-31	63395
1994-03-31	72607
1994-06-30	71297
1994-09-30	80334
1994-12-31	79297
1995-03-31	103697
1995-06-30	95884
1995-09-30	101437
1995-12-31	105835
1996-03-31	94760
1996-06-30	99997
1996-09-30	106943
1996-12-31	117055
1997-03-31	120807
1997-06-30	144126
1997-09-30	127836
1997-12-31	165747
1998-03-31	139757
1998-06-30	146351
1998-09-30	168472
1998-12-31	221804
1999-03-31	168658
1999-06-30	147015
1999-09-30	178722
1999-12-31	192675
2000-03-31	190360
2000-06-30	200565
2000-09-30	201267
2000-12-31	198873
2001-03-31	151810
2001-06-30	155729
2001-09-30	159496
2001-12-31	145692
2002-03-31	137956
2002-06-30	163994
2002-09-30	165637
2002-12-31	175069
2003-03-31	169258
2003-06-30	174559
2003-09-30	181476
2003-12-31	197433
2004-03-31	202472
2004-06-30	209873
2004-09-30	212498
2004-12-31	243229
2005-03-31	204910
2005-06-30	212044
2005-09-30	182356
2005-12-31	170196
2006-03-31	159096
2006-06-30	152457
2006-09-30	149671
2006-12-31	157214
2007-03-31	170693
2007-06-30	159888
2007-09-30	202854
2007-12-31	236933
2008-03-31	333251
2008-06-30	239087
2008-09-30	265216
2008-12-31	215403
2009-03-31	165442
2009-06-30	190520
2009-09-30	210849
2009-12-31	162682
2010-03-31	168973
2010-06-30	176821
2010-09-30	205449
2010-12-31	221445
2011-03-31	192820
2011-06-30	189815
2011-09-30	256780
2011-12-31	265086
2012-03-31	250048
2012-06-30	254067
2012-09-30	236406
2012-12-31	204732
2013-03-31	210986
2013-06-30	201140
2013-09-30	216882
2013-12-31	197504
2014-03-31	194859
2014-06-30	215472
2014-09-30	196594
2014-12-31	198640
2015-03-31	165332
2015-06-30	163809
2015-09-30	162148
2015-12-31	168996